P308
Formation Process of Si Nanoparticles Resulting from Laser Ablation Observed by a Decomposition Method
T. Makimura(*),
T. Mizuta(*),
T. Ueda(*),
D. B. Geohegan(**),
D. H. Lowndes(**),
K. Murakami(*)
(*)Institute of Materials Science, University of Tsukuba,
(**)Solid State Division, Oak Ridge National Laboratory
Light-emitting Si nanoparticles with size of 1-10 nm can be
fabricated by cooling of Si atoms that are ejected from Si targets in
rare gas by laser ablation. Utilizing this pulsed and clean technique,
we may fabricate nanoparticles with well-defined structures. For
this purpose, it is important to understand the dynamics of the
formation process of the nanoparticles.
For measuring time-resolved spatial distribution of the particles, we
have developed a technique. It utilize light emission resulting from
decomposition of the nanoparticles by irradiation of second laser
light. This method is sensitive from molecules that consist of several
atoms to particles with size of more than 10 nm. Applying the
technique, we directly observed a) that particles begin to be formed
300 micro sec after the ablation in 2-Torr Ar gas and b) that they grow
until 1 msec.
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